The Seiko 2C21-5110 is a watch model based on the 2C21 movement.
Parts List
| RE7N51HN00 | crystal - crystal (inorganic) |
| 32N09NA1 | crown |
| 0H1650B01 | case back gasket - case back gasket |
| DH0100B01 | case back gasket - crown and stem gasket (4h) |
| ML36A | band - band |
| ML35A | band - band |
| 05S01DGM | others - minute hand |
| 05SS03NG | others - second hand |
| 05S01DGH | others - hour hand |
| 06S19DBH | others - hour hand |
| 06S19DBM | others - minute hand |
| 06SS07NG | others - second hand |
| A130AS | others - push pin (for lb) |
| 2C210340XS19 | others - dial |
| 2C210350XG14 | others - dial |
| 2C2110 | others - machine code |
| 2C211380XS19 | others - dial |
| 2C21511025A | others - case |
| 2C21511025 | others - case |
| 82710290 | others - case ring |
| 0351225 | others - winding stem |
Caliber 2C21
